Scattering Theory of Charge-Current Induced Magnetization Dynamics

Abstract

In ferromagnets, charge currents can excite magnons via the spin-orbit coupling. We develop a novel and general scattering theory of charge current induced macrospin magnetization torques in normal metal$|$ferromagnet$|$normal metal layers. We apply the formalism to a dirty GaAs$|$(Ga,Mn)As$|$GaAs system. By computing the charge current induced magnetization torques and solving the Landau-Lifshitz-Gilbert equation, we find magnetization switching for current densities as low as $5\times 10^6$~A/cm${}^2$. Our results are in agreement with a recent experimental observation of charge-current induced magnetization switching in (Ga,Mn)As.

Final version accepted by EPL

References in corpus (4)

• Spin Transfer Torques
• Theory of ferromagnetic (III,Mn)V semiconductors
• Influence of a Transport Current on Magnetic Anisotropy in Gyrotropic Ferromagnets
• External Control of a Metal-Insulator Transition in GaMnAs Wires

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